$(document).ready(function(){ 
var newImage = new Image(); //预载入图片 
var oldImage = $('#j1 img').attr('src'); 
newImage.src = '../img/wxx-.png'; 
$('#j1 img').hover(function(){ //鼠标滑过图片切换 
$('#j1 img').attr('src',newImage.src); 
}, 
function(){ 
$('#j1 img').attr('src',oldImage); 
}); 
});
$(document).ready(function(){ 
var newImage = new Image(); //预载入图片 
var oldImage = $('#j2 img').attr('src'); 
newImage.src = '../img/wbb-.png'; 
$('#j2 img').hover(function(){ //鼠标滑过图片切换 
$('#j2 img').attr('src',newImage.src); 
}, 
function(){ 
$('#j2 img').attr('src',oldImage); 
}); 
});
$(document).ready(function(){ 
var newImage = new Image(); //预载入图片 
var oldImage = $('#j3 img').attr('src'); 
newImage.src = '../img/qq-.png'; 
$('#j3 img').hover(function(){ //鼠标滑过图片切换 
$('#j3 img').attr('src',newImage.src); 
}, 
function(){ 
$('#j3 img').attr('src',oldImage); 
}); 
});

